Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 962

May 13, 200332 counties in Arkansas; Latimer County, LeFlore County, McCurtain County, Oklahoma; Bowie County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 13, 2003, 6:18 PM CDT for 32 counties in Arkansas; Latimer County, LeFlore County, McCurtain County, Oklahoma; Bowie County, Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 13, 2003, 6:18 PM CDT (23:18 UTC)
Expired
May 13, 2003, 7:45 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 36 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Prairie County, AR, Scott County, AR, Sevier County, AR, Union County, AR, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Bowie County, TX

The radar

The Little Rock radar (KLZK), 139 km from the middle of the area, began a volume at 23:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.3 hours before the alert went out and 194 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2003-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2003-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1656 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 132319
SWOMCD
SPC MCD 132318 
ARZ000-MSZ000-TXZ000-OKZ000-140045-

MESOSCALE DISCUSSION 0962
NWS STORM PREDICTION CENTER NORMAN OK
0618 PM CDT TUE MAY 13 2003

AREAS AFFECTED...SERN OK...SRN AR...FAR NERN TX...FAR WRN MS

CONCERNING...SEVERE THUNDERSTORM WATCH 361...362...

VALID 132318Z - 140045Z

AT 13/23Z...LEADING EDGE OF SEVERE MCS EXTENDS FROM 25 E MLC TO HOT
TO 40 E OF LIT. ERN PORTION OF THIS SYSTEM IS MOVING 315/40-45KT AND
WILL AFFECT S-CENTRAL AND SERN AR THROUGH 14/01Z. SMALLER-SCALE BOW
ECHO HAS FORMED ON THE WRN EDGE OF THE CONVECTIVE SYSTEM AND IS
MOVING 350/25KT ALONG THE SERN OK/SWRN AR BORDER. THESE STORMS
SHOULD REACH THE OK/TX/AR BORDER REGION BY 01Z.

TENDENCY SHOULD BE FOR INTENSITY OF STORMS IN SERN OK/SWRN AR TO
INCREASE DURING THE NEXT SEVERAL HOURS...WITH DAMAGING WINDS THE
PRIMARY THREAT. THESE STORMS ARE TRACKING ALONG THE ERN PERIPHERY OF
THE SURFACE-BASED INSTABILITY AXIS. AN INCREASE IN SWLY 850MB FLOW
TO 40KTS SHOULD FOCUS LOW-LEVEL WARM ADVECTION/LIFT ACROSS THE WRN
PORTION OF WW 362...IN ADVANCE OF CURRENT STORMS IN SERN
OK...SUSTAINING THIS WRN ACTIVITY THROUGH 14/03Z. SOME SWD
ACCELERATION OF THESE STORMS IS ANTICIPATED AS COLD POOL STRENGTHENS
WITH TIME.

..BANACOS.. 05/13/2003

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MEG...JAN...LZK...SHV...TSA...

33369490 34629505 34759601 35009531 34919382 34509269
35219139 34419104 33119113 33139315 33369490

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 13, 10:08 AM CDTMesoscale DiscussionSPCBenton97 min
May 13, 1:18 PM CDTMesoscale DiscussionSPCBenton, Crawford, Franklin, Johnson, Logan, Madison and 6 more87 min
May 13, 2:20 PM CDTSevere Thunderstorm WatchSPCCrawford, Franklin, Logan, Madison, Montgomery, Scott and 2 more6 hr
May 13, 3:33 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Logan, Madison, Scott, Sebastian and 1 more87 min
May 13, 5:45 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more4 hr
May 13, 5:50 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Cleveland, Coal, Garvin and 7 more3 hr
May 13, 1:53 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Cleveland, Creek, Garfield and 12 more97 min
May 13, 5:04 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 11 more86 min

Nearby

Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.